The E-Force Mayhem Grommet Set from years past is still available! It is a crossover with a couple of other E-Force racquets but will fit your Mayhem.
E-Force Mayhem (includes bumper and grommet set)
Tip: While every racquetball racquet ships with its original bumper and grommets installed, it is always a good idea to purchase a spare set for use during a future restring when needed. The bumper and grommets are a wear item and get worn and cracked over time, increasing the likelihood of string breakage near the frame. These sets are manufactured for a limited period of time once the racquet is released and may not always be available in the future when you need them the most.